If you have stable teams, they can adjust to whatever work you have for them. Even in many transitioning-to-agile organizations, managers find it difficult to think about stable teams. Managers---and team members---often ask, "What do we do if we need an expert for this part?"
Here's the quick answer:
- Ask the expert to work with the team so the team can learn with the expert
- Ask the team to work together so the team can learn without the expert
- If you must use an expert, make sure the expert never works alone.
(from 3 Quick Project Portfolio Tips by Johanna Rothman, from https://madmimi.com/p/8e3ee7?fe=1&pact=213571-133941768-8729210744-a73d911cb2f5ade4eac27b9e35ca4a6b01d07ff2)